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<h1>ACOS</h1>
<p>ACOS 函数可得出数字的反余弦值。</p>
<div class="HIStrings"><p><strong class="Term">ACOS</strong>(<em>数字</em>)</p>
    <div class="HISubString"><p><em class="Term">数字： </em><a href="ffa361b4f72.html#ffa361b4f72"
                                                             class="xRef Aside">数字值</a>。<span
            class="DescriptionNotString"><em>数字</em>必须在范围 –1 到 1 内。</span></p></div>
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<div id="ffa5c84cad" class="Subhead"><h2 class="Name"><strong>注释</strong></h2>
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        <li><p>ACOS 函数可计算余弦值并得出相应的角度。结果角度用弧度表示，范围在 0 到 π (pi) 之间。若要查看以度数而不是弧度表示的结果角度，可在 DEGREES 函数中绕排此函数，即
            =DEGREES(ACOS(<em>数字</em>))。</p></li>
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        <th scope="col"><p class="TableHead">示例</p></th>
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        <td><p>=ACOS(SQRT(2)/2) 将得出 0.785398163397448，约为 π/4。</p>
            <p>=ACOS(0.54030230586814) 将得出 1。</p>
            <p>=DEGREES(ACOS(.5)) 将得出 60（余弦值为 0.5 的角度的度数）。</p></td>
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<div class="LinkUniversal"><strong>另请参阅</strong><a href="ffa5c9a390.html#ffa5c9a390" class="xRef AppleTopic">ACOSH</a><a
        href="ffa5c8aa65.html#ffa5c8aa65" class="xRef AppleTopic">COS</a><a href="ffa5c97cc4.html#ffa5c97cc4"
                                                                            class="xRef AppleTopic">COSH</a><a
        href="ffa5cb3ce6.html#ffa5cb3ce6" class="xRef AppleTopic">DEGREES</a></div>
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